My GY6 (MZ Moskito GY6) had problems with the fuel supply. That's the filter in the tank that I replaced. Can't be sure if that was the only issue not starting as I did lots of other things but since I had old ethanol fuel in the tank changing the valve and filter was probably part of the solution. If you are not getting fuel or even enough fuel these valves have a combination filter and vacuum operated internal valve which could be your problem. Another option is to remove it and just install a manual valve. I left it at the OEM from the factory and this one worked perfectly and matched the fuel tank thread pattern. Ideal!
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